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The National Weather Service said the showers developed around midnight and moved in the north northwest direction.
Lightning could be seen from Hayward, and Berkeley, surprising many residents.
I had to hop on twitter to make sure I wasn't trippin when I heard that thunder lmaoo— Kat (@_katyymariee) June 19, 2017
Lightning and thunder but it's 100 degrees what in the world— Riki (Kim) (@rikimgr) June 19, 2017
The storm then moved onto the Marin County area.
The National Weather Service said the showers would end by daybreak Monday.
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